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Andy,
you say the left thumb is behind the shaft. I am having a hard time grasping that. My grip has the left thumb just to the aft side of center on top of the shaft at address. Does the "feel" of PP1 move behind the shaft as you begin down because the left arm is turned some? Or is it taken literally that the left is always behind the shaft at address etc..I saw Yoda talk about this in his DVD's which I have also, just not in too much detail.
right I have seen the vid, it appears #1 is behind the shaft at impact because it looks left the FLW is angled as you can see the back of his glove and not just a vertical left wrist.
Yoda has said that with a FLW that the left thumb is behind the shaft, just want to make sure I am getting it right.
Tonight, I was playing with the grip some, sliding that left thumb a little over to the right some more, This did allow me to really feel that thumb in the lifeline of the right hand a whole lot more than ever.
At the webbing my thumb and first finger were still together, but the thumb was apart a little more down below.
I have always had that left thumb on top of or just a hair away from the center of the shaft.
I just want to make sure I am not missing out that PP#1 sensation
Anyways, with regard to the left hand grip, it is specific to each individual.
Let your left arm hang at your side (which is low point) and keeping your body and left arm completely still, place the club in your left hand with the heel pad (Thenar muscle) on top of the grip and the clubface perpendicular to the target line, and you will have YOUR perfect left hand grip.
You should always align your clubface at low point, BTW, which will result in the clubface being slightly open at address. (Although, of course, less and less so the ball moves forward.)